Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
76/100r17 vs 90/90r17 Tire Comparison Side By Side
  76/100-17 90/90-17 Difference
Diameter inches (mm) 22.98 (583.8) 23.38 (593.8) 0.39 (10) 1.7%
Width inches (mm) 2.99 (76) 3.54 (90) 0.55 (14) 18.4%
Circum. inches (mm) 72.21 (1834.06) 73.44 (1865.48) 1.24 (31.42) 1.7%
Sidewall Height inches (mm) 2.99 (76) 3.19 (81) 0.2 (5) 6.6%
Revolutions per mile (km) 877.48 (545.24) 862.7 (536.05) -14.78 (-9.18) -1.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.34 mph (32.74 km/h)
25 mph (40.23 km/h)25.43 mph (40.92 km/h)
30 mph (48.28 km/h)30.51 mph (49.11 km/h)
35 mph (56.33 km/h)35.6 mph (57.29 km/h)
40 mph (64.37 km/h)40.69 mph (65.48 km/h)
45 mph (72.42 km/h)45.77 mph (73.66 km/h)
50 mph (80.47 km/h)50.86 mph (81.85 km/h)
55 mph (88.51 km/h)55.94 mph (90.03 km/h)
60 mph (96.56 km/h)61.03 mph (98.21 km/h)
65 mph (104.61 km/h)66.11 mph (106.4 km/h)
70 mph (112.65 km/h)71.2 mph (114.58 km/h)
75 mph (120.7 km/h)76.28 mph (122.77 km/h)
80 mph (128.75 km/h)81.37 mph (130.95 km/h)
85 mph (136.79 km/h)86.46 mph (139.14 km/h)
90 mph (144.84 km/h)91.54 mph (147.32 km/h)
95 mph (152.89 km/h)96.63 mph (155.51 km/h)
100 mph (160.93 km/h)101.71 mph (163.69 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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